The mistakes to catch before post-production

Some faults are repair jobs. Others involve detail that was never recorded. Before asking an editor to rescue a take, it helps to know which problem you have.

Colour shifts, uneven loudness, a fluffed line or background hum may be repairable. The result depends on the recording and how much change it can bear. Ask for a short test before committing to a difficult rescue.

These six checks reduce the chance of making the edit solve a problem that was easier to prevent.

What can an edit recover?

One test covers almost everything. Ask whether the thing you want is somewhere in the recording, buried under something else, or whether it was never recorded at all.

Recorded detail may be recoverable, but separation and correction have limits. A repair is useful when it brings back enough clarity without creating a more distracting fault.

Missing detail cannot be recovered as an authentic record of the moment. A reshoot, a different shot or a reconstruction may still solve the editorial problem; decide which is appropriate for the piece.

Hard to recover

The room was louder than the person

If the microphone sat far enough away that the reflections off your walls arrived at close to the same strength as your voice, both were written into the same file as one signal. Strictly the voice is not gone, it is buried, and the newer tools that separate a voice from a room can sometimes pull it back. It sits on this list rather than the recoverable one because that rescue is uncertain, and pushed far enough it strips the top off the voice as well, so you swap a room for somebody who sounds like they are on a bad phone line. When the room is that loud a reshoot usually costs less than the fix and comes back better. Prevention is moving the microphone nearer, which takes ten seconds and costs nothing.

The level was too high

Clipping is not damage added to a recording. It is information missing from one. The loudest moments hit the ceiling of what the file can hold, the peaks are flattened off, and what happened up there was never written down. Turning it down later gives you a quieter copy of the same flat tops. Prevention is setting the level so that the loudest thing you do, which is usually a laugh, lands comfortably short of the top, then not touching it again.

There was nothing to cut to

With one angle, a trim may create a visible jump. A cutaway, screen recording, suitable crop or deliberate jump cut can still work. Film useful additional detail before you pack away.

The highlights went white

An overexposed area is not bright. It is empty. Every pixel in it holds the same maximum value, so pulling the exposure down afterwards produces grey where the detail should be, not the window, the shirt or the lit side of your face. Prevention is exposing for the brightest thing you care about and letting the rest fall dark, checked once before you start.

The close-up was never filmed

You cannot crop into a shot you did not take. Enlarging a wide frame throws away resolution, and past a certain point the image goes soft in a way that reads as a mistake rather than a choice. If the hands, the pan or the page is the lesson, it has to be filmed at the size it matters at. Prevention is one extra pass over the same action, or a phone left running on the detail while you work.

Something changed halfway through

A change in hair, clothing, light or background can make a continuity cut show. Photograph the setup before a break. If it has already changed, consider a cutaway or a deliberate chapter break before an elaborate repair.

Repair or substitute

The useful distinction is between improving recorded information and creating a plausible substitute for missing information. Both may have a place, but they are different decisions.

Ask what a repair would change, what it would cost and whether the result would still represent the event accurately. A small test can settle more than a promise of either perfection or impossibility.

Ask the editor to distinguish recovery from reconstruction. A de-clipped or rebuilt image may be useful without reproducing exactly what the camera or microphone failed to capture.

What does this change before your next shoot?

Six checks, none of which costs anything: microphone closer, level lower, a second angle or a few seconds of cutaway, expose for what matters, film the detail at detail size, photograph your setup before you begin.

If the footage already has a fault, compare a repair test with the cost and practicality of a reshoot. Sometimes the afternoon spent filming again is the shorter route; sometimes the original moment cannot be repeated.

Sources and evidence

What here is established and what is our own method.

What is established. Two of the six faults in this piece rest on documented technical limits. ARRI's own guidance on highlight clipping states that a clipped highlight holds no detail to recover, in HDR or standard delivery, and that the more contrast a delivery format carries the more visible that clipping becomes, which is the basis for treating an overexposed area as empty rather than merely bright. The resolution arithmetic behind the missing close-up is the same as elsewhere on this site: Recommendation ITU-R BT.709 and Recommendation ITU-R BT.2020 define the pixel counts a punch-in has to work with, and enlarging past them is interpolation rather than recovery. The room-noise fault sits on less settled ground: the peer-reviewed comparison of speech-enhancement methods by Loizou and colleagues, and a more recent study of enhancement artefacts, both find that pulling a voice out of a noisy room trades some naturalness or quality against how much noise comes out, which is why this piece calls that rescue uncertain rather than calling it impossible outright.

Our method. Treating a fault as a reshoot the moment the material was never captured, rather than spending post-production time chasing it, is the practice here.

References.

• ARRI. HDR FAQ (Image Science, Learn & Help). arri.com. Clipped highlights carry no recoverable detail in grading; wider HDR contrast makes clipping more visible. Supports the 'highlights went white' fault. Written in an HDR-workflow context; the underlying clipping principle is general to sensor capture, which the copy states in general terms.
• Iwamoto, K. et al. How bad are artifacts? Analyzing the impact of speech enhancement errors on ASR. isca-archive.org . Modern (deep-learning) enhancement leaves processing artefacts that degrade recognition; artefacts, not residual noise, are the main harm from over-aggressive processing. Measures machine ASR, not human perception directly.